Casein compound.



UNTTnn STATES PATENT OFFICE.

HENRY V. DUNl-IAM, OF NEW YORK, N. Y., ASSIGNOR TO OASEIN COMPANY OF AMERICA, A CORPORATION OF NEW JERSEY.

CASEIN COMPOUND.

SPECIFICATION forming part of Letters Patent No. 717,085, dated December 30, 1902.

Application filed April 7, 1902. fierial N- 101,820. (No specimens.)

To all whom it may concern: tion with heavy clay paper-coatings, and this Be it known that I, HENRY V. DUNHAM, a thin oxalate casein solution will still dry Very citizen of the United States, residing at New quickly. The oxalate casein compound may York, in the county of New York and State be obtained by adding a soluble salt of oxalic 5 of New York, have invented or discovered acid to dry or moist casein or to the milk becertain new and useful Improvements in fore precipitating the latter with an acid, or Casein Compounds and Methods of Producing in place of using a soluble oxalate the milk Same, of which the followingisaspecification. may be precipitated with oxalic acid. I do This invention or discovery has for its obnot wish to limit myself to any particular 1o ject to produce acasein compound from which oxalate, but prefer to use the potassium salt. a very thin casein solution may be made with The amount necessaryto obtain the required a comparatively small amount of water. results may be varied somewhat in accord- The casein compounds at present in use reance with the nature of the solution desired. quire at least from three and one-half to four In practicing my invention or discovery I 15 times their weight of water in order to get preferably form a casein compound by addthe casein solutions sufficiently thin for working to one hundred pounds of dry commercial ing, as in paper-coating, veneering, &c., and casein about two pounds of potassium oxalate in many cases water to the quantity of five and about fifteen pounds of powdered borax to six times, by weight, of the casein comor any other equivalent solvent with an al- 2o pounds is required to get a solution thin kaline reaction. These several ingredients enough to manipulate in a practical way. If are thoroughly mixed together in a dry state, a casein solution nsed,for example, in paperforming a casein compound which may be coating be too thick, it will not in making dissolved by the addition thereto of about the heavy clay coatings flow together in such two and one-half parts, by weight, of water 25 a manner as to make a smooth surface, owing to each part of the oxalate casein compound, to the thickness of the casein solution and the Water being preferably heated to about the false body that it possesses, so that the 160 Fahrenheit in dissolving the casein combrush-marks of the machine will not disappound, thereby forming a casein solution pear before the drying retards flowing of the which is thin enough to manipulate in the 30 solution, and thus the brush-marks will aparts in a practical and commercial way, but pear in the finished surfaces. To obviate which Will not contain so much water that all this objection as far as possible, it has hereobjectionably long time will be required for tofore been found necessary in the use of drying the solution when properly spread casein solutions for paper-coatings to give upon the parts to be coated therewith. 35 the paper two coats of the solution, owing to The invention or discovery is not to be unthe fact that if one heavy clay casein-solution derstood as being limited to the exact proporcoating were applied the brush-marks caused tions or ingredients herein stated or to any by the paper-machine would not sufficiently special oxalate, as different oxalates may be disappear to result in smooth surfaces on the employed or the stated proportions of the in- 0 0 paper, and if sufflcient water were added to gredients may be varied somewhat in accordmake the casein solution so thin as to enable ance with the nature of the solution which it to flow freely the drying would be very may be desired. slow, which is a great objection. I have dis- Having thus described my invention or discovered, however, that by the use of an oxacovery, I claim and desire to secure by Let- 5 5 late or a soluble salt of oxalic acid in the ters Patent casein compound a casein composition may 1. The herein-described casein compound be produced which will be soluble in about formed by adding about two parts of a solutwo and one-half times its weight in water ble salt of oxalic acid and about fifteen pounds and still form a very thin solution which will of a powdered solvent with an alkaline reac- I00 30 flow so freely that a single coating only need tion, to about one hundred pounds of dry be applied to papers in using the casein so1u-- commercial casein.

2. The herein-described casein compound thin solution with a comparatively small consisting of about one hundred parts of dry amount of Water, the same consisting in incommercial casein, about two parts of potascorporating salts of oxalic acid with the casein sium oxalate and about fifteen parts of powto be used in the casein solution.

5 dered borax, all thoroughly mixed together. In testimony whereof I afiix my signature I5 3. A casein compound comprising casein, in presence of two witnesses. oxalic acid and a solvent with an alkaline re- HENRY V. DUNHAM. action. Witnesses:

4. Theherein-described processforproduc- I-I. KIBBE BROOKS,

1o ing a casein compound, adapted to form a W. J. ROIDER. 

